As observed, Dow Theory is one of the most popular technical analysis theories in the investment community. This theory has been developed since the early 20th century by Charles H. Dow and William Peter Hamilton, influencing stock market analysis methods for nearly 100 years.

What makes Dow Theory valuable is the simplicity of its principles. This theory compares stock price movements to ocean waves. When the market is in an uptrend, prices will create new highs and higher lows (Higher Highs and Higher Lows). Conversely, during a downtrend, prices will make new lows and lower highs (Lower Lows and Lower Highs).

An interesting point is that Dow Theory not only looks at trends but also divides market movements into three timeframes: the primary trend lasting over 200 days, the secondary trend lasting from 3 weeks to 3 months, and the minor trend lasting no more than 3 weeks. This helps investors understand which level the market is moving at.

I notice that the key principles of Dow Theory consist of six points, starting from the market absorbing all information to trading volume aligning with the trend. If prices are rising, trading volume should also increase. This confirms that the movement is truly strong.

Each trend has three important phases. The first is the accumulation phase, where prices are still low and large investors begin buying. The second is the major upward correction, where prices rise clearly and present a golden opportunity for investors. The last phase is distribution, where large investors start selling to take profits.

The Double Bottom and Double Top patterns are also important in Dow Theory for predicting trend reversals. A Double Bottom resembles a W, indicating the market is preparing for an upward move, while a Double Top looks like an M, signaling a potential decline.

The advantages of Dow Theory include its stable foundation, ease of understanding, and applicability across various market situations. However, its disadvantages are the delay in detecting changes and the lack of consideration for company fundamentals.

Once investors understand Dow Theory, they can use it to plan their trades. If they expect prices to rise, they place a Buy Order; if they expect a decline, they place a Sell Order to profit. This approach is suitable for CFD trading, which allows trading on both sides.

Overall, Dow Theory remains a valuable tool for investors seeking to understand the market, although it should be combined with other techniques for the best results.